import React, { Component } from 'react'
import './index.css'

export default class Item extends Component {

  state={mouse: false}

  // 鼠标移入、移出的回调
  handleMouse =(flag)=> {
    return ()=>{
      this.setState({mouse: flag})
    }
  }

  // 勾选、取消勾选某一项todo的回调
  handleCheck =(id)=>{
    return (event)=>{
      this.props.updateTodo(id, event.target.checked)
    }
  }

  // 删除一个todo的回调
  handleDelete=(id)=>{
    if(window.confirm('确定要删除吗？')){
      this.props.deleteTodo(id)
    }
  }


  render() {
    const {id, name, done} = this.props
    return (
      <li style={{backgroundColor: this.state.mouse? '#ddd': 'white'}} onMouseLeave={this.handleMouse(false)} onMouseEnter={this.handleMouse(true)}>
        <label>
          <input type="checkbox" checked = {done} onChange={this.handleCheck(id)}/>
          <span>{name}</span>
        </label>
        <button onClick={()=>this.handleDelete(id)} className="btn btn-danger" style={{display:this.state.mouse? 'block': 'none'}}>删除</button>
      </li>
    )
  }
}
